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Finding the Fourth Proportional to 34.20, 51.12 and 31.44

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Solution

The fourth proportional to 34.20, 51.12 and 31.44 is: 46.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.20 : 51.12 = 31.44 : x
  2. Step 2: Convert to fraction form
    34.20/51.12 = 31.44/x
  3. Step 3: Cross multiply
    34.20x = 51.12 × 31.44
  4. Step 4: Simplify right side
    34.20x = 1,607.21
  5. Step 5: Solve for x
    x = 1,607.21/34.20
  6. Step 6: Final answer
    x = 46.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.